The antenna design methodology combined a variety of broadbanding techniques that resulted in a single-layer hybrid monopole antenna coupled to a meander line element and parasitic structures. Characterization of the MIMO antenna included input impedance, scattering parameters and radiation pattern cross sections that were all measured from MHz inside an anechoic chamber.
Received 12 April ; accepted 24 May ; published 30 May ABSTRACT Design of Mimo antenna thesis antennas is challenging in the stringent requirements that are often conflicting to achieve a wide impedance bandwidth while maintaining high radiation efficiency, uniform gain and compact size.
A Multiple-Input Multiple-Output MIMO antenna system can enhance the overall antenna performance but at having to overcome new challenges such as reducing the mutual coupling and the correlation between the elements.
A printed circular disc compact planar antenna is selected in this work due to its UWB performance and compact size for the MIMO antenna system. Mimo antenna thesis parametric analysis is carried out to achieve an optimal design.
The designed antenna system operates over the whole of the UWB bandwidth from 3. Thus the proposed MIMO antenna outperforms similar antenna systems reported in the literature. Introduction UWB is a radio technology that can be used for transmitting and receiving a large amount of data over an ultra-wide frequency band with very low power and for short distances .
It has some advantages like high data rate, low equipment cost, multipath immunity and finally ranging and communication at the same time is possible. In all wireless communication systems, the antenna has an essential role since it is the means by which the signals are converted from electrical to electromagnetic wave form and vice versa.
The design of an UWB antenna is subject to numerous challenges such as achieving a wide impedance bandwidth and keeping high radiation efficiency. This has been the subject of many studies -. Also meeting the equipment physical constraints like size and portability is another challenge.
Research results have proven that some of these challenges can be resolved by adopting a MIMO antenna system. The multiple antenna system increases the diversity gain, multiplexing gain or array gain and thus enhances the overall antenna performance - .
However there are some challenges in designing a MIMO antenna for a technology like UWB including reduction of the mutual coupling and the correlations between the elements.
The objective in this work is to design a MIMO antenna for UWB communication suitable for many applications in a wireless personal area network WPAN that outperforms antenna systems reported in the literature.
The main antenna parameters considered are 1 the bandwidth which is expected to extend over the entire UWB 3. Methodology A time domain solver package was utilized to carry out the design and simulation of the MIMO antenna. The antenna performance including bandwidth, radiation pattern, efficiency, gain, mutual coupling between the MIMO antenna elements, the envelope correlation and diversity gain are examined using the software.
In addition, a script was developed to determine the TARC between the antenna elements. A parametric analysis was carried out to obtain an optimal geometry and configuration subject to the design constraints shown in Table 1 .
MIMO antenna design requirements . Structure of the MIMO antenna. The bandwidth extends from 3. It is observed that these radiation patterns are close to omnidirectional in most of the coverage areas. Gain and Radiation Efficiency The gain and radiation efficiency were observed throughout the supported UWB bandwidth 3.
E-Field left and H-Field right at 3. E-Field left and H-Field right at 9. The average antenna gain is 4. These are shown in Figures respectively. The diversity gain in Figure 9 on the other hand approaches 10 indicating uncorrelated antenna elements of Figure 7.
Frequency versus radiation efficiency. Diversity gain of the MIMO antenna. The emphasis was on developing MIMO antennas with low correlation between the elements and with a low profile.
The basic element that has been used in the proposed design is circular monopole disc printed on in a block of FR-4 dielectric substrate with relative permittivity 4.
Two elements were used and positioned orthogonal to each other with a separation of 8. The simulation results have shown that the antenna system bandwidth extend over the entire UWB bandwidth 3.
The radiation pattern, gain and efficiency have been obtained and found that the developed antennas outperform the antennas reported in the literature.MIMO Sofarwehavestudiedthemodulation,scrambling,coding,channelmodeling,andmulticarrier transmission schemes used in the LTE (Long Term Evolution) standard.
MIMO is the first radio technology that treats multipath propagation as a phenomenon to be exploited. MIMO multiplies the capacity of a radio link by transmitting multiple signals over multiple, co-located antennas.
This is accomplished without the need for additional power or bandwidth. Massive MIMO Antenna Array Design and Challenges Dr Yue Gao A point-to-point MIMO antenna system Multiple&Inputand&Multiple&Output(MIMO)&has& [email protected] MIMO system would require up to a hundred times more such resources than a conventional.
In this thesis dual band arrays for the mobile and the access point are proposed along with dual band mutual coupling reduction and radiation pattern improvement methods.
First a dual band two element printed inverted F stacked monopole array is proposed for the mobile terminal. Antennas in MIMO Systems by Yu Zhou A thesis submitted in conformity with the requirements for the degree of Master of Applied Science The Edward S.
Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 4 Recon gurable Antennas for MIMO S Postgraduate Course in Radio Communications 4 In MIMO-OFDM SLM can be applied to individual antennas in a way that every antenna selects.